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. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: Health Serv Res. 2012 May 11;47(6):2339–2352. doi: 10.1111/j.1475-6773.2012.01426.x

Table 1.

Descriptive Statistics

minimum 25th percentile median 75th percentile maximum
Number of plans, 2010 0 3 6 9 55
Number of plans, 2011 0 3 6 9 50
Change in plans −9 −1 0 0 7
Number of contracts, 2010 0 2 3 4 27
Number of contracts, 2011 0 2 3 4 27
Change in contracts −3 0 0 0 −3
MA Enrollment, 2010 0 3.6% 7.7% 14.2% 50.7%
MA Enrollment, 2011 0 3.8% 7.9% 14.2% 55.5%
Change in MA Enrollment −15.9% −0.2% 0.4% 1.2% 16.0%
MA payment generosity, 2010 −489 79 137 188 752

Note: all figures are based on data from HMO and PPO MA plans only.

Source: CMS’s “Medicare Options Compare” files for 2010–2011, contract-plan-state-county enrollment data for 2010–2011, and Ratebook data for 2010–2011.